The developer community for Wordpress and Wordpress themes is getting to be a pretty big and dedicated group, and Jeffro has come across an interesting Wordpress theme from The_dead_one (TDO), that essentially turns your blog into a forum.
If you head over to TDO's Demo Forum, you can see exactly how this works. You'll notice that post comments are in a forum reply format, giving site visitors an opportunity to create their own "entry" in response to the original blog post. From there, blog posts are then listed by the date of the last comment, instead of the original blog's publish date.
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Any unread topics are highlighted so you can easily see where a good place to get some activity going would be, and the Pages and Categories can in fact be used as Tabs. Most importantly, however, TDO's Forum theme actually makes your blog look like a forum. It's kind of confusing at first, but if you're readily involved with forums on the web, then TDO's theme shouldn't be all that foreign to you.